Add vendor 3D body for Lattice LFE5U-45F-8BG381I (BG381 package)
Symbol ECP5U_45_CABGA381 and footprint LATTICE_BGA_CABGA381 already cover this package generically; add the SamacSys-sourced STEP model as a more accurate alternative body for manual per-instance assignment, same treatment as the existing BG256 body. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01SLWiTVT39zMvgWZfKNvYcP
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